Pitman for drilling-machines.



W. C. SGLE.

PHMAN FOR Dammi; MACHINES.

l APPLICATION FILE() FEB. 8. 1917.

Lzh l Patented oet. 30,1917.

' WITNESSES if? TTORNEYS WILLIAM -C. SOLE, OF SULLIVAN, INDIANA.

PTMAN FOR DRILLING-MACHINES.

` Specification of Letters Patent.

Application led February 8, 1917. Serial B10/147,275.

T 0 all whom t may concern.'

Be it known that I, WILLIAM C. SOLE, a

citizen of the United States, and a resident l of Sullivan, in the county of Sullivan and State of Indiana, have invented a new and improved Pitman for Drilling-Machines, of

'lies in the want of suitable resiliency or 'cushioning means between the' power and the walking beam connections. .It must be borne in mind that the string of`tools and the means for suspending the same in a deep hole are very heavy, and therefore the power devices must be very strong to effect the normal operation of the device, to say 'nothing of the unusual strains that are incident to 4the sticking of the' tools in the hole. ,Va-

rious expediente have been resorted to for providing means to relieve the shocks in cident to the operation of these machines, so as to prevent breakage of the connections or straining of the power shaft or the like;

Among the objects of this. present improvement therefore is to provide a pitman having a construction which may be termed telescopic and which includes a spring having length and. compressibility enough to allow thecrank to make a complete rotation in case the tools stick in the hole, thereby preventing breakage of the connections or the breaking or bending of the power shaft. Said spring also has sufficient rigidity or strength to rovide for the normal operation .of the wal 'ng beam.

` Another object of the invention is to provide improved facilities for connecting the end of the pitman tothe band wheel crank,

lwhereby the samemay be disconnected readily for the purpose of renewing the bearings op other purposes.

With the foregoing and other objects in view the invention consists in the arrangee ment and combination of parts hereinafter described and claimed, and while the invention is not restricted to the exact details of construction disclosedor suggested herein, still for the purpose of illustrating a practical embodiment thereof reference is hady to the accompanying drawings, in which like reference characters designate the same parts in the several views, and in which- Figure 1 is a side elevation of my invention, shown applied to one end of a walking beam and the power crank;

F ig. 2 is a front elevation of the same with the walking beam omitted;

F ig. 3 isv an enlarged side elevation of the lower end of the pitman, parts being in section; and l Fig. 4' is aview at right angles to-Fig. 3 and with the parts in the same relative position.

Referring now more particularly to the drawings, I show at 10 a walking beamv adapted to be oscillated from any well known power or band wheel 11, having an aXle 12 and crank 13.y A wrist pin 14 is adjustably connected in any oneof the series 4of holes 15 in the free end of the crank.

The improved form of pitman comprises a stirrup 16 secured to the end of the walking beam in the usual manner and attached by means of bolts 17 ,v or their equivalent, to the upp'er end of a tubular member or cylinder 18, having formed in its opposite sides a pair of longitudinal slots19. A cap 20 is rigidly secured to the lower end of the tube 18 and is provided with a central hole 20 therethrough.

Patented oet. so, ieri..

Another main portion of the pitman'comi prises a plunger 21 formed upon or secured in any suitable manner to the head or body 22, which may be of rectangular form in cross` sectiom or provided with fiat faces, Said plunger projects upwardly through the hole 20 of the cap and the upper or free end of the plunger is screw threaded for c0- operation with a nut or runner 23,. preferably of a form to fit within the interior of the tube 18, but provided with lugs -24 which project outwardly through the slots 19, whereby the runner is held from rotation. -A powerful master spring 25 surrounds the plunger betweenthe'runner at.

Sti

other rportion et the tools become stuck so that the danger oic breakage or twisting of the power shaft is'practically eliminated.

Since the tube 18 is held troni rotation by means of the stirrup l5 the adjustment oi the runner with respect vto the plunger may be etl'ected readily by rotation et' the head and plunger While the runner is held from rotation by the tube'. vThe cap end ofthe tube 18 is adapted' to moveniore or less freely foward and from the head 22.

The third main portion of yhe pitman comprises astrap portion consisting of tivo parallel straps or plates 2G articulated or jointed to the head 22h31 means of a strong pivot pin or bolt 2'? and around which pivot the lower endoil the pitman is adaptedto swing freely in one directiomfnaniely, away from the crank, b utis limited in its move- ,e ment in the other direction by means ofV a. square shoulder 28 adapted to cooperate with the cap 20. is an additional means5 lioiveverjto nl alre tliepitrnan as a Whole rigid, or prevent the relative movement oi' the strap portion 26 laterally with respect to the head 22 and tube 19g-l provide alocking pin 29 arranged between the two straus 26 and adapted to be projected its upper end into a socket 30 formed in theV lon/'er end of the head Said pin 29 isguided t air ot cross pieces or guides 3l andr?. vvnich serve also as stiiieners or braces :tor the straps. i spring' 33 acts upon the pin at one end tending to 'torce it 'into the socket against'the gnide 32. il link Se is pivoted at to the lower end 'of tile pin.

rl`he bearings for the 'Wrist le ccn .e we o o ,5g acts between the bearing at one end guide il `the other end.1 The action or the spring tends to holdthe movable bearing 3T dov-7n against the lined bearing and in contact. with the wrist pin. To the npper end ot the shank is pivoted at e3, a link de of the saine character the linlr el.

l5 indicates transverse bolt or pivot rod extending lieti-veen and through the straps 26 about haliivay between the bracesV or guides 32 and il. i leverfl is pivoted centrally upon this pivot rod lo and is held centered thereon by means olf sleeves di". The links 3e and la are pivoted respon`y 'vely at the points 3d and All" at equal dista c 30 While the other end et tls-e sV rin@g bears' l a main ripper portion including rigid heed i* l rod l5. The lever and links are so formed that when the free end or the'lever is swung down, as shown kin Figs. 3 and'i, the link .Se and pin 29 are drawn down against the torce of the spring 33, said pin thus being Withdrawn vfrom the socket 80, and at the saine time the shank et() and movable bearing 37 are drawn npvvardly against the torce or' the spring a2. 3l and f however, of the links pass the dead center or'beyond the lines joining the anis ci the pivot rod d5 and the respective points of connection between the links and the pins, whereby the parts Will be automatically locked and heldin' the position indicated in Fig. '3. 'lhe bearings being thus separated and the locking pin 29 being Withdrawn from the rigid head 22, it is easy for the strap portion ot the pitnian to be swung laterally, as shown in dotted lines in 2 for the purpose of disconnection :trom the Wrist pin. ll-he 'main bearing 36, or the one vwhich is subjected to the major portion of theservice may then be' easily removed or replaced by a new one by simply removing the bolts 39 and allowing theplate 3S and bearing 36 to be slipped on or beyond the loyver endsciE the straps. lWhen the parts are again assembled and the pitman connected to the Wrist pin, a simple reverse or upward movement or' the lever do permits `the springs 33 and 42 to snap the parts back the 'lever ddivill thusbe 4carried Well up toward or between the straps 36.

l claim: l. ln a pitnaan, the combination ot a tnbular member having a cap secured 'to its loiver end and being provided in its op posits sides with parallel longitudinal slots, a. rigid head at the lower end or the tubular memberJ 'a plunger yconnected to the head and extended through the cap and into the tubular member, the' upper vend of the plungerV being threaded5 a runner cooperating with the t needed portion of the plunger and'having lugs projecting into said slots to prevent rotation thereof While the head and plunger be rotated, a powerfulsnrrounding the plunger Withinl t e lower end oiE the tubular member beta een said cap and said runner and serving to hold the head close to the cap, a lower end oonnecting member pivoted to said head and Yadnpted to Vswing laterally from' thek general direction or the axis or the pitman so aste facilitate the adjustment of the plunger with respect lto the tubular nieinben and means acting between the connecting inereber and said head to lock the saine in alinement.

2. a pitinan, the combination Witn i i- .1. `A naving a socket in its loiver endj a lowe- -n The pivot points lli? connecting member including a pair'of bearings, one of the bearings belng movableup wardly :tronc the other,v a locking member carried by the latter mentioned member and coperatng with said socket to hold the .parts in rigid alinement, and lever devices connected to said locking member .and said movable bearing to move them both toward each other to facilitate the disconnection of the pitman from the power devices.

3.- In a Pitman, the combination of a main upper portion including a rigid head, a

lower end connecting member, means-piv-ot-` our able longitudinally thereof into coperationy with the head to lock the two main parte in rigid alinement, a Sprngactingdnpon the locking member to hold it 1n lo ng position, and lever connections with said locking member serving to withdraw -it from locking position and automatically hold it so withdrawn.

Y' WILLIAM GSOLE. 

